Controlling means for hoisting apparatus



C. ZETTERLUND CONTROLLING MEANS FOR HOISTING APPARATUS Filed March 1, 1923 2 Sheets-Sheet 1' Jan. 1, 1924 A 1,479,574

. c ZETTERLUND CONTROLLING MEANS FOR HOIS'IING APPARATUS v 7 Filed March 1, 1923 2 Sheets-Sheet "2 PatentedJan. 1, 1924.

errso STATES:

PATENT CARL ZETTERLUND, OF GHICAGQILLINOIS.

CONTROLLING MEANS FOR HOISTING APPARATUS.

Application filed March 1, 1923. seen No. 622,015.

particular relation to the controlling means for that type of such apparatus designed for use in building construction, for elevating material from a lower floor or point to an upper one, and for lowering material from an upper floor or point to a lower floor or point of a building, and it consists in certain peculiarities of the construction, novel arrangement and combination of the various parts thereof as will be hereinafter more fully set forth and specifically claimed.

The principal object of the invention is to provide an apparatus of the above mentioned general character, which shall be greatly simplified in its construction and operation over that of the machines or apparatus of the same class heretofore in general use, with its parts so made, arranged and 00- operating with one anotheras to produce high efiiciency, ease and rapidity in handling or moving material, yet in a most safe and secure manner.

Another object of the invention is to furnish a hoisting apparatus by means of which material can be raised to or lowered from a great height simultaneously, or if desired, can be raised to or lowered from intermediate points between the base and top of the apparatus.

Furthermore, the invention contemplates the provision and use of improved mechanism for controlling, clutching and releasing a pair of cable-winding drums whereby they will be caused to alternately elevate and lower a pair of elevators or cages of'the apparatus, said operation being controlled at a point remote from said drums.

Other objects and advantages of the invention will become apparent from the following description and explanation. The invention will be explained and more readily understood when read in conjunction with the accompanying drawings, in which one embodiment of the invention is disclosed, it being obvious that changes and modifications may be resorted to without departing from the spirit of the invention, so

long as they come within the scope of the appended claims'forming a part hereof. In the draw1ngs, Figure 1 1s a plan view of a hoisting apparrice.

rat-us embodying the invention, illustrating the position of the parts when one of the ele vators or carriers of the apparatus is in its raised positlon and the other one in its low I ered position.

Fig. 2 is a side view in elevation, shortv ened for the convenience of illustration, and illustrating the parts in the same position as shown in Fig. 1.

Fig. 3 is a view partly in section and partly in elevation taken on line 3-3 of Fig. 2 looking'in the direction indicated by the arrows, with the elevators of the apparatus in I the same position as shown in Figs. 1 and 2.

Fig. 4 is a view partly in section and partly in elevation, taken on line 44 of Fig. 1 looking in the direction indicated by the arrows.

Fig. 5 is a plan sectional view taken on line 5-5 of Fig. 2, and

Fig. 6 is an enlarged sectional view of a portion of one of the combined cable-winding drums and clutch therefor of the apparatus, showing it mounted on a portion of the supporting shaft therefor.

Corresponding numerals'of reference refer to like parts throughout the different views of the drawing. v

The frame of the machine comprises a base 10 having near one of its ends spaced uprights 11 which are united at their upper ends by a cross-piece 12 and which uprights constitute the guide rails for the elevators.

or carriers of the apparatus, as well as afford support for certain members of the controlling means of the apparatus. The frame also includes an upright hollow pillow block 13 which is mounted on the base 10 near its end opposite the uprights 11, which block serves for the bearings of the drive shaft and main driven shaft of the apparatus, as well as a housing for the transmission gears which connect said shafts.

Transversely journaled on the block or housing 13 is a driven shaft 14 which has mountedthereon a gear 15which is shown as being of the worm gear type, and which meshes with a worm 16 on that end of a power shaft 17 located in the housing 13 below the shaft 14 and at a right angle to said shaft. The power shaft 17 may be driven by any suitable means not shown, and

while I haveshown the gearing for transmitting power from the shaft 17 to the shaft 14: as being of the worm and. worm gear type,

extends laterally'from eachside of the spokes v 20 and has at'one of its edges a peripheral flange 22 and at its other edge a peripheral flange 23 provided with spaced teeth24t to act asratchet teeth for the purpose to be presently explained. That part of the run.

21 of each of the drums adjacent the ratchet toothed flange 23, is provided with a plurality of spaced inwardly extended lugs 25, which are preferably equi-distantly spaced.

As is best shown in Figs. 5 and 6, each of the drums l8 is provided on one side only ofthe spokes 20, with a hub 19 and the hub 26 of the clutch is mounted on the shaft 14 and fixed thereto by means of a key 27 on the opposite side of said spokes. A washer 28 is by preference interposed between each of the hubs 19 of each drum andthe adjacent end of the hub 26 of the cl utch, and sur rounds the shaft, as is obvious. Extended from each hub 26 is an arm 29 which terminates at its free enda short distance inwardly from the inner surfaces of the lugs of each drum. Pivotally'mounted near its outer end on one side of the arm 29 near.

its outer end, is a clutch arm 30 which is provided around its pivot point with a flat faced hub31 to provide an enlarged bearing against the arm 29 in order to prevent wabbling of theelutch arm 30 in the operation of th'edevice.

Mounted on the pivotof the arm 30 is a spring 32 which has one of its ends in engageinent with the arm 30and its other, end

connected to the arm 29 so as to retract said.

arm after it has been drawnout of engage ment with one of the lugs 25 bya means presentlyto be explained. Extended radially from thehub'31 of the ,clutcharm is a lug engaging ar1n33 of such length'that when the clutch arm 30 is moved-from the position shown by continuous lines, to that shown by dotted lines in Fig. 6 of the drawing, its outer end willnot contact ,with the inner surface of the flange of the drum but will contact with one of the straight edged sides of one of thelugs 25 on the flange of the drum. Connected to the, free end ofeach of the clutch'ar'nis 30 is one end of a cable 34, each of whichengages pulley 35 mounted on an upright 36 located near the outer each side of said upright frame work is a vertically disposed bracket 39, each of which has at its lower end a rearwardlyextended and apertured arm 40 and at a suitable dis tance above said arm with another rearwardly extended arm 41 each of which has an opening near itsrear end for the reception of a pivot pin or fulcrum 4L2 for one of the levers 38 above mentioned. Each of the levers 38 has about midway'between its ends an upright 43, each of which is provided with a laterally extended pin 4st to which one end of a spring is secured the other end of which is secured to the outer end of the arm 10 of each of the lever supporting brackets. It will be understood that the pivot 42 and securing points 40 and 43 for each of thesprings 45 are so located with respect to one another that when either lever 38 is depressed at its rear end, the line of tension of the spring actuatingv said lever will be rear-wardly of its axis, thus holding the lever in its depressed position until its rear end is manually elevated, Whenit will be understood that the line of tension of its spring will be forwardly of the lever fulcrum and will hold the front end of said lever in its depressed position. Eachofthe levers 38 has secured to its front end the, upper end of a cable 37 which pass over the pulleys 46, as above mentioned, and. eachis secured at its lower end to the upper portion of a safety dog 4:7 one of which is pivotally mounted onthebase 10 directlylin the rean of the toothed flange 23 of each of the come bined winding drums and clutches for en gagement with the teeth of said flanges. Each of the dogs 17 is provided at its rear lower portion with an eXtensionLS to con-. tact with a portion 19 of the bracket 50.on which it is mounted for the purposeof preventing said dog assuming a positionrean. wardly of a vertical line through its axis,v yet permitting enough movement of the dog to allow it to be disengaged fromthe teeth of the ratchet with which it is adapted for engagement.

Mounted for vertical movement in each.

of the guide-ways provided by. the rails. or

vertically by the rails of the upright frame work of the main frame. J ournaled on' the upper portion of said upright are a pair of sheaves 52, which are so located that their rims will be positioned for movement in a vertical line extended through the middle of v a transverse connection 53. with which each of the cages or elevators 51 is provided at its upper end.

Secured to the middle portion of each of the connections 53 of each of the cages is one end of a cable 54 which is extended over the pulleys 52 downwardly in front of the upright frame work of thelnain frame and thence under a pair of pulleys 55 which are preferably swiveled on the lower portion of the upright or main frame.

As is clearly shown in Figs. 1 to 3 inclusive of the drawings, one reach of the cable 54 is around a pair of pulleys 56 mounted on the base 10 near and in front of the winding drums, as is clearly shown in Fig. 1 of the drawings. By this arrangement it is evident that the winding drums on which the cable 54 is wrapped, will be so connected thereby to the elevators, that in the rotation of the driven shaft 14 on which the drums are loosely mounted, until fixed to said shaft by means of the clutches carried by said drums, the elevators will be alternately raised and lowered and this operation can be controlled by an operator stationed at the upper end of the upright frame work of the apparatus in order to reach and manipulate the levers 38 of the device.

In controlling the operation of the apparatus, it will be understood that by placing the levers 38 with their ends downwardly inclined, in which position the lever which controls the operation of the drum in front of the cage which is shown in its lowered position, the clutches will be caused to engage the lugs 25 of each drum, by reason of the action of the springs 32 of said clutches. The forwardly inclined positions of the levers 38 will also hold the safety dogs 47 out of engagement with their ratchets. In the elevation of either cage an upward extension 57 on the upper part thereof, will strike the forwardly inclined portion of its operating lever, thus moving the front portion of said lever upwardly and permitting the spring 45 to hold said lever with its rear end in a downwardly inclined position as shown by one of the levers in Fig. 2 of the drawings. This operation automatically throws the safety dog 47 in position to engage the ratchet on the drum in front of the cage which has been elevated and automatically throws and holds the clutch of said drum out of engagement therewith.

As-the clutch arms 30 are rotated by the driven shaft 14, it is manifest that in order to prevent the cables 34 which connect said clutch arms with v the operating levers becoming twisted, said cables are secured to the clutch arms so as to have a swivel action with respect thereto, and this may be accomplished by means of a knot 58 on the end of each cableadj acent the opening in the clutch arm through which it is extended.

. Should it be desired to stop the elevators at points intermediate the top and bottom of the upright framework, it is apparent thatthe operating lever 38 which controls the clutch arm of the driving drum can be manipulated so asto throw its clutch arm out of engagement with the lugs of said drum, at which time the safety lever 47 will be caused to automatically engage the peripl1- eral rack of said drum and thus prevent further movements of the elevators.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is I 1. An apparatus of the class described including in combination a main frame comprising a base and an upright frame-work thereon, said frame-work providing vertical guideways, a cage in each of said guideways for verticalmovement, a spring actuated lever on eachof said guide-ways, the spring of each lever acting thereon to alternately hold its .ends in oppositely inclined positions, a driven shaft transversely journaled near one end of the base, means to drive said shaft, a pair of drums loosely mounted on said shaft and each having inwardly extended lugs, a supporting arm keyed to the said driven shaft adjacent each drum, a spring actuated clutch arm pivotally mounted on each of said supporting arms, a connection uniting each of said clutch arms to one of said levers, and a cable co-operating with said drums and cages whereby the cages will be alternately raised and lowered by the rotation of the driven shaft.

2. An apparatus of the class described including in combination a main frame comprising a base and an upright frame-work thereon, said frame-work providing vertical guide-ways, a cage in each of said guideways for vertical movement, a spring actuated lever on each of said guide-ways, the spring of each lever acting thereon to alternately hold its ends in oppositely inclined positions, a driven shaft transversely journaled near one end of the base, means to drive said shaft, a pair of drums loosely mounted on said shaft and each having a peripheral toothed rack, a safety dog pivotally mounted on said base to engage the rack of each drum, and a connection uniting each of said dogs to the front end of one of said levers.

I appa atu foft e class de.scribe d,1. the combination with a main framehaving an upright frame work "providing ggu-ideways for a pair of elevators or: cages,-of

an elevator or cage locatedinjeachofisaid guide-ways for vertical movement' therein,

adriven shaft transversely jou naled on the main frame 1n front of saiduprji'ght, frame work, means to drive said shaft,- a pair jof drums loosely mounted-on said; driven shaft and each having a peripheral toothed rack '7 and inwardly extended spacedlugs, apair,

ofipulleys journaled orif themainiframejin: frontof said drums, a pair ofpulley s' journaled on,the upper portionof saidfupright, frame work, a pair ofpulleys'journaled on o the. lower front portionlof said" frame work, a cable extended around theffirst namedpair of pulleys and wound on eaclrof said drums and extended therefrom around the pulleys f at the lower portion of said frame work and over the pulleys at the toplthereof and onereach'of said cable being secured to one of, the elevators and the other reach thereof to the other elevator, a supporting arm keyed to said driven shaft adjacent each drum and extended therefrom to near the innerends of said lugs, a spring actuated clutch arm pivotally mounted on saidsupporting arm andhaving a lug. engaging arm' extended from its pivot and adapted for vengagement with a lug on the drum, a gravity actuated;

safety dog pivotally mounted to engage the peripheral rackgof each drum, a lever fulcrumed on the upper portion of said up-. right frame Work near each cornerthereof, a cable connecting the frontejndfof veach lever to each-fof, said clutch arms and anothericable connecting the front end of each lever torone of said "dogs.

' 'An apparatusofthe class described ineluding in combinatioman upright framework providing aivertical guide-way, a cage in sa1d;gu1deway for vertical Vmovement,

means to raise and lower said cage, a lever lheld in suclrpositionby said spring.

5,} An apparatusfofithe classdescribed including in jcomloina tion anupright framewor k providing a vertical guide-way, a cage in said guide-Way-for --vertical-movement, means tQHra-ise landlower said cage, a lever fu-lcrumed one saidframe-work, and having an extension projecting from .its fulcrume'd portion, a spring connected at. oneof its a ends torthe outer portion of said extension and-Lat itsfother end to a fixed point, opposed with respect to said lever to the extension thereon said springbeingso located with respectrtoj the lEVBT I UICTLID'I that when the lever is'tilted in either, direction, it will he held rin such position by said spring, and

rmeans ontheupper portion of the cage for contact with the: lever on one side of its fulcrum.

CARL ZETTERLUND. 

